packaging: setup: display only top level setup packages

currently we print a message with entire transaction content of modified
packages for setup packages.

better to show only setup packages in price of some performance.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1075043
Change-Id: I3a1f27090aa362882047007416aacff1cb5dbc4c
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>